CRYOGENIC REFRIGERATION APPARATUS AND METHOD FOR RAISING TEMPERATURE OF PULSE TUBE REFRIGERATOR

摘要

A cryogenic refrigeration apparatus 10 includes: a pulse tube refrigerator 12 having a pulse tube 16; and a pulse tube refrigerator rotating mechanism 14 for rotatably supporting the pulse tube refrigerator 12 so as to change the posture of the pulse tube refrigerator from a cooling posture to a temperature raising posture. When the pulse tube refrigerator 12 is in the cooling posture, the inclination angle formed by the vertical line and the central axis of the pulse tube 16 assumes a first angle, and when the pulse tube refrigerator 12 is in the temperature raising posture, the inclination angle assumes a second angle. In the case where the inclination angle when the low-temperature end of the pulse tube 16 is directed vertically downward is 0 degrees and the inclination angle when the-low temperature end of the pulse tube 16 is directed vertically upward is 180 degrees, the second angle is larger than the first angle.